Stamping process



Aug. 1929- P. SCHWARZ STAMPING PROCESS Filed Jan. 19, 1928 Q/WTIJPatented A11 27, 1929.

PHILIP? SCHWABZ, 0F BARMEN, GERMANY.

ST'AMIING PROCESS.

Application filed January 19, 1928, Serial No. 247,994, and in GermanyJuly 26, 1924.

When in a single machine the two appertaining discs for making atwo-part article, for example a button, are continuously stamped out oftwo continuously fed metal strips, hitherto the discs from the one striphave usually been laterally carried by a special transporting slide outof the range of one strip into the range of the other strip in order toenable the two discs to be united. It has also been proposed to unitethe two discs at a punch position lying between the two strips.According to the present invention a special transport device movlngcrosswise with relation to the strip is dispensed with, by arranging thestrips to cross one over the other, so that the union of the two discscan be effected at the crossing point without lateral movements. Withmultipart articles this arrangement can be repeated, the lowest stripbeing crossed two or more times by other strips lying above 1t.

The strips are crossed at an oblique angle, so that the tools operatingat the crossing point can be arranged next to one another, in a straightline or row of such length as to operate upon as many discs as possible.The crossing angle is therefore preferably chosen so that rows of discsof the greatest possible length in each strip come into register, in thedirection of which rows the tools are arranged.

The invention is illustrated in the accompanying drawing in which thefigure is a plan view showing two strips at the point of crossing andthe arrangementof the tools for acting thereon, unessential parts beingomitted to avoid confusion in the illustration.

In the drawing, a is the lower metal strip and Z) the upper metal stripcrossing it. It has been assumed that tools at n in known manner stampdiscs in the strip a in inclined rows, these discs not being separatedfrom the strip but only domed or otherwise formed. The strip 6 in whichdiscs are also first stamped crosses the strip a in such a manner that astraightv inclined row of discs comes into register at the crossingpoint with an inclined row of discs in the lower strip a. At m the toolsare arranged in line with these two rows of discs, which tools serve topunch the discs completely out of the upper strip 1) and to unite themwith the corresponding discs in the lower strip a. This union can be ofa preliminary character, consisting merely in the smaller discs from thestrip 6 being inserted in the domed or otherwise formed larger discs ofthe lower strip a. It has further been assumed that the discspreliminarily united in this way, are conducted to tools at 0 whichseparate the discs from the strip w and effect the pressing together ofthe discs.

If a three part article is being made, when the discs must be stampedout of three strips, the third strip is arranged between m and 0 so thatit also crosses the lowest strip a. At this crossing point the thirddisc is united with the two others, the final union again being effectedat 0. In the same manner four or any number of discs can be united.

The procedure after the preliminary union of the discs is subordinate tothe invention; the lowest strip with the various other preliminarilyunited discs could be supplied to another separate machine for finallyuniting the discs.

It is also conceivable for the discs to be completely stamped out of thelowest strip a. In this case a transport band shown in dotted linescould be provided in known manner below the lowest strip a which bandreceives the stamped out discs in corresponding counter punches andcarries them parallel with the strip a at proper intervals to thefurther operating points. In this case also a special laterally movingtransport slide which carries the discs out of the range of one stripinto the range of the other strip, is unnecessary. This is of particularadvantage when more than two discs have to be united, since then thetransport band only moves under the lowest strip parallel therewith inorder to carry the discs to the union points, that is to the crossingpoints of the lowest strip with the various other strips.

Having now particularly described and ascertained the nature of my saidinvention

